Photocatalytic NOx Removal

NO_x + O₂ + H₂O → HNO₃

Tổng quan

TiO₂ photocatalyst on building surfaces oxidizes nitrogen oxides (NOx) from vehicle exhaust to nitric acid (HNO₃), which is then washed away by rain. Photocatalytic concrete and pavement coatings can reduce local NOx levels by 25–45%. This passive pollution remediation works continuously in sunlight.

Người tham gia

Vai trò	Chất	Hệ số	Trạng thái
Chất phản ứng	Water H₂O	1	(l)
Sản phẩm	Nitric Acid HNO₃	1	(aq)

Ví dụ thực tế

Some cities use photocatalytic concrete in roads and buildings that actively clean the air of vehicle exhaust pollution.

Tầm quan trọng công nghiệp

Photocatalytic construction materials represent a growing market for air quality improvement in urban environments.

Tính chất

Loại: Photochemical
Thuận nghịch: Không
Năng lượng: Tỏa nhiệt
ΔH: -206,0 kJ/mol
Chất xúc tác: TiO₂ (titanium dioxide)

Phản ứng liên quan

Photochemical Smog Formation (NO₂ Photolysis) Photochromism of Spiropyran Chlorophyll Fluorescence Photodegradation of Methylene Blue by TiO₂ Photodissociation of Chlorine Gas Silver Bromide Photodecomposition Cis-Trans Isomerization of Retinal Photosynthesis Ozone Formation by UV Light Dye-Sensitized Solar Cell (Grätzel Cell)

Frequently Asked Questions

What is the equation for Photocatalytic NOx Removal?

The balanced equation is: NOₓ + O₂ + H₂O → HNO₃.

What type of reaction is Photocatalytic NOx Removal?

Photocatalytic NOx Removal is a photochemical reaction.

Is Photocatalytic NOx Removal exothermic or endothermic?

Photocatalytic NOx Removal is exothermic (releases energy). The enthalpy change (ΔH) is -206.0 kJ/mol.

What conditions are needed for Photocatalytic NOx Removal?

This reaction requires a catalyst (TiO₂ (titanium dioxide)).